msm: vidc: Uses on-chip memory for video codecs

Video driver allocates on-chip memory (OCMEM) and
hands it over to the video hardware for internal usage.
Video encode/decode performance improves with OCMEM.

Change-Id: Ic6e35278db24cedc003aa33d5e3cef52172e2254
Signed-off-by: Vinay Kalia <vkalia@codeaurora.org>